Atosis

{{Short description|Being in Abenaki and Algonquian folklore}}

Atosis or Kci-Athussos is a mythological being from Abenaki and Algonquian folklore in northeastern North America. It is a large, swimming snake.{{cite book|title=Algonquin Legends of New England|url=https://books.google.com/books?id=Ikzuixf1TrIC&dq=Atosis&pg=PT85|accessdate=May 23, 2023|year=2020|author=Charles Godfrey Leland|author-link=Charles Godfrey Leland|publisher=Library of Alexandria|isbn=9781465505033}}

In one legend, Atosis had once been a human man but became a snake later. He fights the hero Glooskap but never manages to kill him. In one of the stories, Atosis captures Glooskap's brother, Abistanooch the marten. Glooskap tells Abistanooch how to trick Atosis, and they defeat him together.{{cite book|chapter-url=https://books.google.com/books?id=6mRJAAAAYAAJ&dq=atosis&pg=PA115|accessdate=May 23, 2023|chapter=The Fourteenth Tale:Glooskap and Atosis|title=Indian Hero Tales|author=Gilbert Livingston Wilson|author-link=Gilbert Livingston Wilson|year=1916|publisher=American Book Company|isbn=9781974134830|pages=115–121}}

In another story, a woman has fallen in love with the snake, and she lures her husbands, one after the other, to the water for the snake to eat. In another, the woman falls in love with the snake but does not kill her husband or harm anyone.

Maine writer Christopher Packard numbers Champ, the cryptid of Lake Champlain among Atosis.